Clock



FIG. 1 is a perspective view of a clock showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4; is a right side elevational view with the left side being amirror image thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom view thereof.

The ornamental design for a clock, as shown and described.